JPS6225344Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vacuum lift device that lifts an object while it is adsorbed.

In the past, there have been various types of devices that use electromagnetic force or vacuum pressure to attract objects, but these devices can only be used automatically if they are connected to a lift device that drives vertically, such as a crane. It is capable of achieving the function of lifting objects.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that uses a single pressure source to adsorb an object and also uses the same pressure source to lift and drive the adsorbed object.

The present invention fixes one end of an axially expandable lift tube in a predetermined position or connects it to a movable part, and connects this lift tube to a vacuum pump. A suction device for suctioning and supporting an object is provided at the other end of the lift tube, and includes a suction pad attached around a suction port and in close contact with a surface to be suctioned. A control valve is provided to open and close an opening provided in a part of the lift tube, and a stopper is provided to elastically support the initial opening degree of the control valve. As a result, the lift tube can grip and support the object by the negative pressure inside it, and can also lift the object in the axial direction of the lift tube.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a lift tube 1 is formed of a material having airtightness and elasticity, such as rubber or resin, into a bellows-like cylindrical shape, and a coiled wire (not shown) is interposed therein. This allows expansion and contraction in the axial direction while maintaining the cross-sectional shape perpendicular to the axis.

The lift tube 1 is connected via a connector 2 to a hose 5 that communicates with a vacuum pump (not shown).

As shown in FIG. 2, a disk 9 is rotatably attached to a body 6 of the connector 2. body 6
The base end 1A of the lift tube 1 is fastened and fixed via the annular band plate 7, while a joint portion 10 is integrally formed on the disk 9, and the hose 5 is connected through the joint portion 10. Note that 11 is a gasket that seals between the body 6 and the disk 9.

A valve seat 13 is attached to the body 6, and a valve body 15 for opening and closing the opening 14 is attached. This constitutes a check valve that opens without resistance to the flow of air from the lift tube 1 to the hose 5 and closes against the opposite flow.

This prevents the pressure inside the lift tube 1 from rising suddenly when the vacuum pump stops operating due to a power outage or the like.

An ear fitting 16 is fixed to the disk 9, and the connector 2 is connected to the lift tube 1 via this ear fitting 16.
is connected to a pulley 18 running on a rail 17, for example.

As shown in FIG. 3, the adsorption device 20 attached to the lower part of the lift tube 1 has a body 21 equipped with a suction port 22 that communicates between the inside and outside of the lift tube 1 connected to the tip end 1B of the lift tube. An annular pad 23 made of an elastic material is attached around the periphery.

A poppet valve 25 is provided at the suction port 22, and comprises a valve seat 26 formed on the body 21 and a valve body 27 seated on the valve seat 26 through the elastic restoring force of a tension spring 28.

A switching rod 29 is screwed into the valve body 27 and fixed via a nut 30. When the switching rod 29 comes into contact with the surface to be attracted, the valve body 27 lifts up from the valve seat 26, that is, the poppet valve 25 opens.

The control valve 30, which adjusts the pressure inside the lift tube 1 by introducing atmospheric air, has a valve seat 31 formed in the body 21, and a valve plate 32 seated on the valve seat 31, as shown in FIG. 33
Connect via hinge.

A sub-control valve 35 is provided on the valve plate 32.

The sub-control valve 35 has an opening 36 formed in the valve plate 32, and a valve body 38 seated on a peripheral edge 37 of the opening 36 is hingedly connected via a pin 39.

A return spring 40 that biases the valve body 38 in the closing direction is installed, and a stopper bolt 41 that comes into contact with the valve body 38 in the open position is installed via a flange 42, and the sub-control valve 3
The maximum opening degree of 5 can be adjusted.

An operating lever 44 is rotatably connected to the pin 33 that supports the valve plate 32.
The intermediate rod 44A of No. 4 is connected to the valve body 38 via a link 44B or the like.

By rotating the operating lever 44, the sub-control valve 35 is opened and closed, and
After the sub-control valve 35 is fully opened and locked, the control valve 30 opens and closes.

A stopper 45 that contacts the operating lever 44 is attached to the body 21. Body 21 and stopper 4
A guide member 47 that slidably supports the rod portion 46 of No. 5 is fixed, and the guide member 47 and the stopper 4
5, a spring 48 is interposed between the spring 48 and the spring 48. A nut 49 is screwed onto the end of the rod portion 46, thereby adjusting the position where the stopper 45 is urged by the spring 48 and extends and the initial opening degree of the sub-control valve 35. In other words, the tension of the spring 48 acts as a biasing force on the valve plate 38 to open the valve via the operating lever 44 and the link 44B, but the amount of deformation of the spring 48 in the valve opening direction at this time is determined by the stopper 45. As a result, the initial opening degree of the sub-control valve 35 is given, and the initial opening degree is adjusted according to the amount of extension of the stopper 45.

Next, the effect will be explained.

First, operate the vacuum pump and lift tube 1.
reduce the pressure inside. At this time, the control valve 30 closes due to the valve plate 32 being sucked;
The sub-control valve 35 is held at a constant opening via an operating lever 44 that abuts a stopper 45 to prevent the pressure inside the lift tube 1 from becoming too low and overloading the vacuum pump.

As shown in FIG. 1, hold the operation handle 50 and extend and retract the lift tube 1 while bringing the suction device 20 close to the object 51, and the switching rod 29
1a, the poppet valve 25 opens,
The object 51 is attracted by applying low pressure inside the lift tube 1 to the surface to be attracted. At this time, suction pad 2
3 is in close contact with the attracting surface 51A to prevent outside air from entering.

At this time, the operating lever 44 is rotated counterclockwise against the stopper 45 that is biased by the spring 48, and both the control valve 30 and the sub-control valve 35 are fully closed. The pressure may be temporarily increased to strengthen the suction force.

When the object 51 is attracted, the pressure difference between the atmospheric pressure and the atmospheric pressure acting in the vertical direction of the surface to be attracted is
1, suction device 20, lift tube 1, etc.

Therefore, when the opening degrees of the sub-control valve 35 and the control valve 30 are adjusted to appropriately determine the differential pressure, the object 51 moves upward while the lift tube 1 is contracted in the axial direction.

When the object 51 is to be separated from the suction device 20, the control valve 30 is opened widely via the operating lever 44 and atmospheric air is introduced. The differential pressure becomes smaller than the load of the object 51, and the vacuum suction is canceled.

Note that, as the weight of the object 51 to be transported becomes heavier, the initial opening degree of the sub-control valve 35 is made smaller.

The object 51 can also move along the rail 17 via the pulley 18 and rotate via the disk 9.

Note that the connector 2 may be fixedly attached to a predetermined position, and in this case, if a lateral load is applied to the object 51 via the operation handle 50, the lift tube 1 can be bent three-dimensionally within a certain range. Object 5
1 can be moved.

Further, in the above embodiment, the sub-control valve 35 is provided as a part of the control valve 30, and the initial opening degree is set via the sub-control valve 35. 35, a spring 48 and a stopper 45 are provided.
It is also possible to set the initial opening degree by directly pushing the valve plate 32 of the control valve 30, in which case the number of parts can be further reduced. However, depending on the capacity of the vacuum pump and the pressure receiving area of the valve,
When a relatively small opening 36 is opened and closed as in the embodiment, the rate of change in the opening area with respect to the valve opening becomes smaller, which has the advantage of making it easier to finely adjust the suction force.

In summary, the present invention uses a lift tube that can be expanded and contracted in the axial direction to adsorb an object, so it is possible to lift the object while it is adsorbed using a single pressure source, which saves labor in loading and unloading work. can contribute to

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention,
FIG. 2 is an oblique view of the connector, FIG. 3 is a cross-sectional view of the suction device, and FIG. 4 is a perspective view of essential parts of the suction device. 1... Lift tube, 20... Adsorption device, 2
2...Suction port, 23...Suction pad, 30...Control valve, 35...Sub control valve, 44...Operation lever, 45...Stopper, 48...Spring.

Claims (1)

[Scope of utility model registration request] One end of a lift tube that can be expanded and contracted in the axial direction is fixedly or movably supported, and the lift tube is connected to a vacuum pump, while a suction port that communicates the inside and outside of the lift tube is provided at the other end of the lift tube, and the suction A suction pad is attached around the mouth to tightly adhere to the suction surface, while a control valve that opens and closes the opening provided in a part of the lift tube, a spring that biases this control valve in the opening direction, and this spring are attached. and a stopper that restricts deformation of the control valve in the valve opening direction and provides an initial opening degree of the control valve.